were held用法were heldare heldwill be held在什么情况下用?

were held 用在过去时的被动语态
are held用在一般现时的被动语态
will be held 用在将来时的被动语态
held 是hold的过去分词形式,意为：举办
eg.The concert will be held on this Firday.
are held were held同样用法

首先你要明白 be held 是被动. 就是什么东西(主语) 被 举行/抓住/....
其次要搞清楚时态. 第一个是过去时(过去发生)并且主语是复数. 第二个是一般现在时(一般状态),第三个是将来时(将来会发生)
你要弄清楚,这个动作是什么时候发生的,然后就选择合适的时态...